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A healthy canine vulva tastes out of heat mostly like a very decent (= low intensity) buzzling / sparkling, which is mixed to some sort of emulsifier and there's a very light metallic sour-salty aftertaste, but not intense enough to actually let one distinguish between sour and salty.
If you know the water based kefir / kephir and mix one that is quite sparkly and intensely citrus like with around 2/3 water and let it rest for some hours, it should resemble it quite well. That's at least what comes into my mind if I try to compare it to something.
It stays on the tongue for quite a while and doesn't taste bad, if she is clean and healthy, at least for me. But still, I am less in giving oral, as it doesn't seem that stimulating as different ways and there's always quite a high risk for bacterial remains which might disturb the balance.
It as well is based a bit on what the dog eats. Same goes for humans, but in more intense variety, as humans are quite the carbohydrate eaters.